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dc.contributor.authorSchouten, Stefan  Concept link
dc.contributor.authorHopmans, Ellen C.  Concept link
dc.contributor.authorvan der Meer, Jaap  Concept link
dc.contributor.authorMets, Anchelique  Concept link
dc.contributor.authorBard, Edouard  Concept link
dc.contributor.authorBianchi, Thomas S.  Concept link
dc.contributor.authorDiefendorf, Aaron  Concept link
dc.contributor.authorEscala, Marina  Concept link
dc.contributor.authorFreeman, Katharine H.  Concept link
dc.contributor.authorFurukawa, Yoshihiro  Concept link
dc.contributor.authorHuguet, Carme  Concept link
dc.contributor.authorIngalls, Anitra  Concept link
dc.contributor.authorMenot, Guillemette  Concept link
dc.contributor.authorNederbragt, Alexandra J.  Concept link
dc.contributor.authorOba, Masahiro  Concept link
dc.contributor.authorPearson, Ann  Concept link
dc.contributor.authorPearson, Emma J.  Concept link
dc.contributor.authorRosell-Mele, Antoni  Concept link
dc.contributor.authorSchaeffer, Philippe  Concept link
dc.contributor.authorShah, Sunita R.  Concept link
dc.contributor.authorShanahan, Timothy M.  Concept link
dc.contributor.authorSmith, Richard W.  Concept link
dc.contributor.authorSmittenberg, Rienk  Concept link
dc.contributor.authorTalbot, Helen M.  Concept link
dc.contributor.authorUchida, Masao  Concept link
dc.contributor.authorVan Mooy, Benjamin A. S.  Concept link
dc.contributor.authorYamamoto, Masanobu  Concept link
dc.contributor.authorZhang, Zhaohui  Concept link
dc.contributor.authorSinninghe Damste, Jaap S.  Concept link
dc.date.accessioned2010-04-21T15:52:36Z
dc.date.available2010-04-21T15:52:36Z
dc.date.issued2009-03-20
dc.identifier.citationGeochemistry Geophysics Geosystems 10 (2009): Q03012en_US
dc.identifier.urihttps://hdl.handle.net/1912/3289
dc.descriptionAuthor Posting. © American Geophysical Union, 2009. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geochemistry Geophysics Geosystems 10 (2009): Q03012, doi:10.1029/2008GC002221.en_US
dc.description.abstractRecently, two new proxies based on the distribution of glycerol dialkyl glycerol tetraethers (GDGTs) were proposed, i.e., the TEX86 proxy for sea surface temperature reconstructions and the BIT index for reconstructing soil organic matter input to the ocean. In this study, fifteen laboratories participated in a round robin study of two sediment extracts with a range of TEX86 and BIT values to test the analytical reproducibility and repeatability in analyzing these proxies. For TEX86 the repeatability, indicating intra-laboratory variation, was 0.028 and 0.017 for the two sediment extracts or ±1–2°C when translated to temperature. The reproducibility, indicating among-laboratory variation, of TEX86 measurements was substantially higher, i.e., 0.050 and 0.067 or ±3–4°C when translated to temperature. The latter values are higher than those obtained in round robin studies of Mg/Ca and U37 k′ paleothermometers, suggesting the need to primarily improve compatibility between labs. The repeatability of BIT measurements for the sediment with substantial amounts of soil organic matter input was relatively small, 0.029, but reproducibility was large, 0.410. This large variance could not be attributed to specific equipment used or a particular data treatment. We suggest that this may be caused by the large difference in the molecular weight in the GDGTs used in the BIT index, i.e., crenarchaeol versus the branched GDGTs. Potentially, this difference gives rise to variable responses in the different mass spectrometers used. Calibration using authentic standards is needed to establish compatibility between labs performing BIT measurements.en_US
dc.format.mimetypeapplication/pdf
dc.language.isoen_USen_US
dc.publisherAmerican Geophysical Unionen_US
dc.relation.urihttps://doi.org/10.1029/2008GC002221
dc.subjectTEX86en_US
dc.subjectBITen_US
dc.subjectRound robinen_US
dc.subjectHPLC/MSen_US
dc.titleAn interlaboratory study of TEX86 and BIT analysis using high-performance liquid chromatography–mass spectrometryen_US
dc.typeArticleen_US
dc.identifier.doi10.1029/2008GC002221


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